<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <input
    id="upload"
    type="file"
    multiple="multiple"
    accept="accept"
    @change="handleChange"
  >
  <button id="btn">上传</button>
  <script>
    const handleChange = () => {
      console.log(123);
    }
  </script>
</body>
</html>